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Takayama-Muromachi, Eiji; Matsui, Yoshio; Uchida, Yoshishige; Izumi, Fujio; Onoda, Mitsuko; Kato, Katsuo . (1988). Identification of the Superconducting Phase in the Nd-Ce-Sr-Cu-O System. Japanese Journal of Applied Physics, 27(Part 2, No. 12), L2283–L2286. doi:10.1143/JJAP.27.L2283 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research